Aumaan's power was far higher than 23 gigatons, but yeah, I think Thanos takes it. The amount of power in an orbital frame is typically over 25 terawatts. The amount of power used on the entire planet earth currently is around 13.5 TW. Now, where does Anubis stand? Btw, given the warping abilities, use of sub-space pockets as defensive weapons and self healing power, Anubis is at least far above most earth based super beings, even if he isn't up to par with Surfer.